.jar file in linux

Hi everybody, when I click on a jar file that I exported from eclipse, I get following error message: the utility zip is not in your PATH Please install it or contact your System Administrator.

I have no idea what's wrong here, are .jar files not supported in linux? What do I have to do?

ok, i figured i would have to use java -jar /filepath the problem then is that it says failure to load main-Class manifest attribute I dont know what's wrong, but under windows the app runs perfectly fine.